Glossary
The terms listed here are my own personal interpretation of them for the report, and I do not advocate them as being totally reliable. In April 2006, I added Wikipedia entries to the bold headings so you can compare. If you require further clarification on some of these terms, then please contact me on e-mail. Where necessary, I have included the web address of important companies or organisations where further information can be obtained.
- Acorn
- Cambridge,
UK based computer manufacturer set up in 1978 as a small firm. Subsequently
designed the BBC Micro, as used in many schools, followed by the Archimedes
range, and the Risc PC. Contains the company's own operating system, RISC OS,
which is capable of running extension cards to provide PC/Windows capability.
The company closed its computer division in September 1998, effectively ending
20 years of UK computer manufacturing, to specialise in digital television solutions.
- Apple
- California
based computer company responsible for the Macintosh computer, co-designed by
co-founder Steve Jobs. It was the first computer to utilise the now standard
desktop environment on its first release in 1984.
- CD-ROM
- A compact disc specially formatted to contain digital media
of any form for use on a computer. It should not be used in a normal audio CD
drive! CD-ROM discs are formatted to an agreed standard, called ISO 9660, to
allow any computer to run it, regardless of the platform it was written for.
- Desktop
- A computers metaphoric representation of how files and data are stored
in its memory or on its hard disc, through the use of onscreen Icons.
- DOS
- Disc Operating System. Low level control language used in the oldest
PCs to handle discs and user commands. Being difficult to use, it was superseded
by Microsoft's own version, MS-DOS. It was phased out with the release of Windows
95.
- DOS extensions
- Three letters at the end of a filename (e.g. REPORT.DOC
indicates that the file is a Microsoft Word document) that require adding to
all files on pre-Windows 95 PCs, to older systems determine their type. Although
these letters are not required in Windows 95 or later operating systems, they
are still used by multimedia designers to ensure that files will run correctly
on these older “legacy” systems.
- Fork
- Name given to special Macintosh files used to describe the
file's type and what created it. Normally invisible to Macintosh users, they
can be seen on PCs and Acorn machines. Various forks are possible; data forks
(the actual file data), icon forks (responsible for giving a Macintosh file
its icon), and resource forks (containing a unique four letter code describing
the file type). They are responsible for letting Macintosh files work!
- GIF (Graphics Interchange Format)
- Image format devised by the
network company Compuserve (http://www.compuserve.com)
for the quick transfer of images across networked computer systems. It has now
been adopted by the World Wide Web as a common method of image transfer.
- HTML (HyperText Markup Language)
- The computer language used for the
design of WWW pages on the Internet. It was first used in 1990, the year the
World Wide Web was born.
- Icons
- Visual aids used to represent items on a desktop. They can
tell you what type of data the file is, and enable the user to identify what
software can open it.
- Internet
- See World Wide Web (WWW)
- ISO 9660
- International Standards Organisation (http://www.iso.ch) CD-ROM Blueprint. Agreed in 1988 by key CD manufacturers, ISO 9660 consists
of a set of rules governing how a CD-ROM should operate on any computer, and
covers how files and directories are written to a CD-ROM. All CD-ROMs must comply
with the standard, in order to be accepted on any computer and its CD drive.
- Java (http://www.javasoft.com)
- (Related terms JavaOS, JDK, PersonalJava etc.). Developed by Sun
Microsystems (http://www.sun.com), Java is
an interpreted language capable of being run on any computer which supports
it fully, thereby being platform independent. Any program written in Java does
not need any altering for it to be run on another platform.
- Java Virtual Machine
- Software which interprets the Java language to
platform specific code. It sits “on top” of the computer’s operating system,
and enables any Java written programs to run smoothly on that computer. In order
to run Java on a particular platform, it must have a Java Virtual Machine written
for it.
- JPEG (Joint Photographic Experts Group)
- A file standard for photographic
images that is platform independent. It allows high quality rendering, yet utilises
an intelligent compression system to make files very small.
- MAC OS
- Apple’s Macintosh Operating System. Formerly known as System
6, 7 etc., it differs substantially from PC Windows, but is partly hard disc
based. It supports DOS formatted floppy discs to allow compatibility with PCs.
- Macromedia (http://www.macromedia.com)
- California based software company formed in 1988, and responsible for developing
the leading multimedia production package Director, as well as other multimedia authoring tools such as Flash, Dreamweaver and Authorware, all available in both Macintosh
and Windows versions. Macromedia was merged with Adobe in 2005.
- Microsoft (http://www.microsoft.com)
- Seattle, Washington based company co-founded by William (aka Bill) Gates,
and responsible for the design and marketing of the Windows operating system.
It is the largest computer firm in the world.
- MPEG (Movie Player Experts Group)
- An agreed standard for the playing
of digital movies across many platforms. The movie equivalent of JPEG.
- Network Computer (NC)
- Small device which is connected to a phone
line and a television, allowing users to surf the Internet, without the need
to purchase a more expensive desktop computer. Software is stored at a central
location, and is sent automatically to the NC when it is updated. The user may,
however, add a storage device to it for peace of mind. The NC is operated by
a smart card that is password protected, and with the card, any NC in the world
can be used, for it will link to your personal account. The NC was designed
by Acorn, on behalf of Oracle Corporation.
- Operating system
- The computers brain, containing all its commands
and knowledge. Without it, the computer is useless. It is either based in ROM
chips or based on the hard disc of the computer.
- Palette
- The number of colours available on the computer screen. The
palette system on each platform is arranged differently, so that images created
on one platform can appear subtlely different on another. Palettes are measured
in terms of bits i.e. 1 bit (black and white) up to 32 bit (16 million colours).
- PC (Personal Computer)
- Originally known as the IBM PC (named after the
company, IBM (http://www.ibm.com) which first
produced small ready to run home computers), the IBM was dropped after they
failed to patent their design, enabling many firms to release their own computer,
or clone. Nowadays, nearly every PC runs some form of Microsoft Windows to give
the PC a “desktop.”
- Platform
- Term used in computing to describe a distinct model or type
of computer, usually by manufacturer or by the software which drives it. This
report describes three platforms, the PC, the Macintosh and the Acorn.
- Quicktime (http://www.quicktime.apple.com)
- Apple’s patented movie playing system. Quicktime movies are supported on Macintosh,
PC and to a certain degree, Acorn platforms. It is one of a number of movie
playing systems. Others include AVI, Replay and MPEG.
- RAM (Random Access Memory)
- The computers short term memory, used by
software during operation. When the computer is turned off, all the contents
of the RAM are deleted.
- RISC (Reduced Instruction Set Computing)
- Technical term used to describe
how a computer can run using a small set of built in instructions, thereby increasing
its speed, and reducing power consumption. It is seen as the future direction
of microprocessor technology.
- RISC OS
- Acorn’s own operating system, as used in the Archimedes and
Risc PC range of computers. It differs from Windows 95 and MAC OS by being a
ROM based operating system, that is not reliant on the hard disc inside the
computer. This hereby reduces the chances of the operating system breaking down
or becoming infected by a computer virus.
- ROM (Read Only Memory)
- The computers permanent memory, whereby powering
down the machine has no effect on it, the opposite of RAM. Operating Systems,
or any commands vital to the running of the computer are usually stored in ROM.
- SCSI (Standard Computer Systems Interface)
- Agreed standard to
enable external devices (such as Syquest drives) to interface with any computer,
in order to function. There are three versions of the standard, the second,
SCSI-II being the most common, and most established.
- Shockwave
- Browser technology developed by Macromedia to allow Director
files to be incorporated within a webpage. The technology compresses the file
and all resident sounds stored within it, to allow faster downloading, and streaming,
which plays the file before it has finished downloading. A newer variation of
Shockwave, Shockwave Flash, allows vector animated multimedia to be produced
within a webpage. Vector graphics are more efficient than bitmaps, resulting
in even faster downloading off the Internet.
- Syquest (http://www.syquest.com)
- US manufacturer of recordable media devices for computers, which filed for bankcruptcy in 1998. Products included
the EZ135, EZFlyer and Syjet removable cartridge drives. They are similar to
normal floppy disc drives, yet each cartridge can as much as 1500 times more
information than a floppy disc. Other manufacturers of such drives include Iomega (http://www.iomega.com), who produce the
Zip and Jaz drives. All these drives are used heavily in design to transport
large pieces of work.
- WWW (World Wide Web)
- Also known as the Internet, it is the global
network of computers which transfer textual and graphical information to users.
Text and images can include an interactive element, whereby clicking on an item
will display another page of information. All pages are programmed using HTML.